7b8d2495ca
By replacing `XMLHttpRequest` with a `fetch` call, the helper function can be modernized to use async/await instead. Note that the headers doesn't seem necessary to set now, since: - The Fetch API provides a method for accessing the response as *text*, which renders the "Content-type" header unnecessary. - According to https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name, the "Content-length" header isn't necessary.